1. Inorganic Crystal Structure Database, 1998.
2. JCPDS-International Centre for Diffraction Data, 1997.
3. Lee, W, Phil, D. and Rainford, W 1994. Ceramic microstructures, property control by processing. Department of Materials Engineering and Sorby Center for Electron Microscopy, University of Sheffield, UK. First Edition 1994.
4. Richardson, D. 1982. Modern Ceramic Engineering, Ed. Marcel Dekker 1982, p. 152.